It wasn’t a detailed plumbing drawing- he had shown one line going to all units while the contractor pointed out that it is better to show individual lines to each unit as repairs and maintenance are easier. and some towns even require it . 

With a full time job even 15 units gets tough between collecting rent keeping repairs up, preventative maintenance, looking for new deals, managing refinances, etc. 

Online Facebook groups can be fruitfulOnce you find a property things tend to move fast so have a good contractor available to help you estimate repairs. 

If a major expense comes about (i.e. roofing repair, hvac, etc) we would split that as well. 

Considering the high deductible on House B, I am only filing a claim for House A, and coming out of pocket for the cost of repairing or replacing the roof for House B. 

If selling is on the table, a 1031 exchange could allow you to defer taxes and reinvest in properties with better cash flow or lower maintenance needs.Since repairs are mostly handled, it might be worth reviewing your rents to see if there’s room to increases/ways to improve cash flow.

If I don't make the repairs to the MH I won't be able to rent it at all.

Whereas habitability issues, like structural repairs, may.

If I purchase a duplex and live in one side and decide to renovate the side I’m living in. Can I write off/ deduct my expenses for the renovation?I would be doing this to be able to rent it out in the future at a high...

Are you certain the after repair value will justify this $40,000 budget?